Rotating tool for working in earth, rock, metal, wood, and the like



Sept. 3, 1929. o. ROLFSEN 1 1,726,923 ROTATING TOOL FOR WORKING INEARTH, ROCK, METAL, WOOD, AND THE LIKE Original Filed Dec. 17, 1925NVENTOR ATTORNEYS Patented Sept. 3, 1929.

UNITED STATES PATENT, QFFICE.

ROLFSEN, OF LARVIK, NORWAY.

ROTATING TOOL FOR WORKING IN EAR-TH, ROCK, METAL, WOOD, AND THE LIKE.

Original application filed December 17, 1925, Serial No. 75,983, and inNorway December 23, 1924. Divided and this application filed February 1,1928. Serial No. 251,208.

The present invention relatesto tools for working in earth, rock, metal,wood and the like and more particularly to tools which comprise discsmounted on a rotating shaft and having hammer heads in connectiontherewith.

The hammer heads may be given a polygonal form, such as, for example, atriangular form and are provided with a center opening havingapproximately the same polygonal form as the outside edge of the hammer.Due to the conformation of the center opening the hammer head is adaptedto take up a definite number of positions on a pin on which the hammeris mounted. The pin is con nected to the rotating disc by means ofmembers such as, for example, levers or arms.

For an example of apparatus adapted for carrying out the inventionreference is made to the accompanying drawing in which;

Figure 1 is a vertical view of the cutting tool;

Fig. 1 is a similar view of a modification.

Fig. 2 is a side view of the cutting tool; and

Fig. 3 is adetail view of a modified part of the construction.

Referring to the drawings, Figure 1 shows a tool which comprises a mainshaft 10, and a disc 11 mounted thereon in any appropriate manner. Thedisc 11 is provided with indentations 12 in its outside curvature forthe hammers. The levers 13 and 14 are pivoted to both faces of the discnear the indentations 12. These levers 13 and 14 are provided with slots15. The pins 16 pass through these slots thereby forming a slidableconnection with said levers. The pins 16 may be provided with suitablemeans such, as for example, the heads or shoulders 17 to keep said pinsin position. The portion of the pins disposed in the slots of the leversmay be provided, if it is found desirable, wit-h friction resistingelements, such as, for example, the bearings 18. Likewise, if desired,the levers 13 and 14 may be counterbalanced by extensions 19 (Figure 1)in order to reduce the stress on the pins 16 when the disc 11 isrotated. In order to limit the motion of the levers and the pins towardthe center of the disc, the disc is provided with the projections 20which limit the outward movement of the extensions 19 (Figure 1) of thelevers. The hammer heads 21 are of triangular form with a center opening22 having approximately the same form. The

hammer heads 21 are mounted on the pins 16 between the levers. Thecenter openings 22 engage the pins 16 and are dimensioned so as to allowthe hammer heads a certain amountof loose play on the pins. Theindentations 12 are made sufficiently large so as to allow free rotationof the hammer heads on the pins 16.

When the disc 11 is rotated, the pins and hammer heads will be held intheir extreme outward position, the stress on the pins being reduced toa minimum by the counterbalancing effect of the extensions 19 of thelevers. If the hammers should strike an obstacle, the pins may bepressed radially inwards due to the construction of the slots in thelovers but will return immediately to the outward position due to thecentrifugal force acting onthe hammer heads.

The levers 13 and 14 may be replaced by i the arms 23 and 24 shown inFig. 3, the arm 23 being provided with a yielding link such as, forexample, the bolt 25 and the helical spring 26.

In the drawings, the disc 11 is equipped with only two hammer heads butit is evident that by increasing the size of the disc or by decreasingthe dimensions of the levers and hammer heads, the disc may be providedwith a greater number of hammer heads.

This application is a division of my previous application for a rotatingtool for working in earth, rock, metal, wood and the llirge, Serial No.75,986, filed December 17,

I claim:

1. A rotating tool for working in earth, rock, metal, wood and the likewhich comprlses a disc mounted on a rotating shaft, hammer headsrotatably mounted with loose play on pins, lever rotatably mounted onsaid disc and adapted to hold said pins so as to allow them to moveradially with respect to said rotating shaft.

2. A rotating tool for working in earth, rock, metal, wood and the likewhich comprises a rotating shaft, a disc on said rotating shaft, leverspivoted to said disc, pins connected to said levers, said levers beingadapted to allow said pins to move radially with respect to saidrotating shaft, and hammer heads rotatably mounted with loose play onsaid pins.

3. A rotating tool for working in earth,

rock, metal, wood and the like which comprises a rotating shaft, a discon said rotating shaft, levers pivoted to said disc, pins mounted inslots in said levers so as to allow said'pins to move radially withrespect to said rotating shaft, and hammer heads rotatably mounted withloose play on said pins.

4. A rotating tool for working in earth, rock, metal, wood and the likewhich comprises a rotating shaft, a disc on said rotating shaft, leverspivoted to said disc, pins mounted in slots in said levers so as toallow said pins to move radially with respect to said rotating shaft,counter weights on said levers to relieve the stress on said pins duringrotation of the shaft and hammer heads rotatably mounted with loose playon said pins. 7

5. A rotating tool for working in earth, rock, metal, wood and the likewhich comprises a rotatin shaft, a disc on said rotating shaft, leverspivoted to said disc, pins mounted in slots in said levers so as toallow said pins to move radially with respect to said rotating shaft,counter-weights on said levers to relieve the stress on said pins duringrotation of said shaft, means for limiting the inward motion of the pinstowards the shaft and hammer heads rotatably mounted with loose play onsaid pins.

6. A rotating tool for working in earth, rock, metal, wood and the likewhich comprises a rotating shaft, a disc on said shaft, indentations inthe circumference of said disc, levers pivoted on said disc, pinsconnected to said levers, said levers being adapted to allow said pinsto move radially with respect to said rotating shaft, means for limitingthe inward motion of the pins towards the shaft and hammer heads mountedwith loose play on said pins.

7. A rotating tool for working in earth, rock, metal, wood and the likewhich comprises a rotating shaft, a disc on said shaft, indentations inthe circumference of said disc, levers pivoted on said disc, pinsmounted in slots in said levers so as to allow said pins to moveradially with respect to said rotating shaft, counter-weights on saidlevers to relieve the stress on said pins during the rotation of saidshaft, and hammer heads rotatably mounted with loose play on said pins,said indentations being dimensioned so as to allow said heads to rotatefreely on said pins.

In testimony whereof I affix my signature.

OLE ROLFSEN.

